最近，看了好多的app的等待对话框，发现自己的太lower，于是就研究了一番，最后经过苦心努力，实现一个。
- 自定义一个loadingindicatorview(extends view )类
- 编写values/attrs.xml，在其中编写styleable和item等标签元素
- 在布局文件中loadingindicatorview使用自定义的属性（注意namespace）
- 在loadingindicatorview的构造方法中通过typedarray获取
描述就提供这些，一下是代码的展示，非常的详细。
1、自定义属性的声明文件
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<declare-styleable name="avloadingindicatorview">
<attr name="indicator">
<flag name="ballspinfadeloader" value="22"/>
</attr>
<attr name="indicator_color" format="color"/>
</declare-styleable>
<pre name="code" class="html">
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loadingindicatorview.java
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import android.annotation.targetapi;
import android.content.context;
import android.content.res.typedarray;
import android.graphics.canvas;
import android.graphics.color;
import android.graphics.paint;
import android.os.build;
import android.support.annotation.intdef;
import android.util.attributeset;
import android.view.view;
import com.chni.lidong.androidtestdemo.r;
/**
* created by lidongon 2016/1/31
*
.ballspinfadeloader,
*
*/
public class loadingindicatorview extends view {
//indicators 指示器
public static final int ballspinfadeloader=22;
@intdef(flag = true,
value = {
ballspinfadeloader,
})
public @interface indicator{}
//sizes (with defaults in dp)
public static final int default_size=45;
//attrs
int mindicatorid;
int mindicatorcolor;
paint mpaint;
baseindicatorcontroller mindicatorcontroller;
private boolean mhasanimation;
public loadingindicatorview(context context) {
super(context);
init(null, 0);
}
public loadingindicatorview(context context, attributeset attrs) {
super(context, attrs);
init(attrs, 0);
}
public loadingindicatorview(context context, attributeset attrs, int defstyleattr) {
super(context, attrs, defstyleattr);
init(attrs, defstyleattr);
}
@targetapi(build.version_codes.lollipop)
public loadingindicatorview(context context, attributeset attrs, int defstyleattr, int defstyleres) {
super(context, attrs, defstyleattr, defstyleres);
init(attrs, defstyleattr);
}
private void init(attributeset attrs, int defstyle) {
/**
*获取typedarray(属性的集合)
*/
typedarray a = getcontext().obtainstyledattributes(attrs, r.styleable.avloadingindicatorview);
mindicatorid=a.getint(r.styleable.avloadingindicatorview_indicator, ballspinfadeloader);//获取编号属性
mindicatorcolor=a.getcolor(r.styleable.avloadingindicatorview_indicator_color, color.white);//获取颜色属性
a.recycle();//回收属性的集合
mpaint=new paint();
mpaint.setcolor(mindicatorcolor);//设置画笔的颜色
mpaint.setstyle(paint.style.fill);//设置画笔的样式为填充
mpaint.setantialias(true);//去锯齿
applyindicator();//
}
private void applyindicator(){
switch (mindicatorid){
case ballspinfadeloader:
mindicatorcontroller=new ballspinfadeloaderindicator();
break;
}
mindicatorcontroller.settarget(this);//将控件设置到当前view
}
@override
protected void onmeasure(int widthmeasurespec, int heightmeasurespec) {
int width = measuredimension(dp2px(default_size), widthmeasurespec);//获取view的宽度
int height = measuredimension(dp2px(default_size), heightmeasurespec);//获取view的高度
setmeasureddimension(width, height);//
}
/**
*测量的 维度
* @param defaultsize 默认大小
* @param measurespec {@see widthmeasurespec,heightmeasurespec}
* @return 返回测量的结果
*/
private int measuredimension(int defaultsize,int measurespec){
int result = defaultsize;
int specmode = measurespec.getmode(measurespec);//测量规范
int specsize = measurespec.getsize(measurespec);//测量大小
if (specmode == measurespec.exactly) {//父控件已经为子控件设置确定的大小，子控件会考虑父控件给他的大小，自己需要多大设置多大
result = specsize;
} else if (specmode == measurespec.at_most) {//子控件可以设置自己希望的指定大小
result = math.min(defaultsize, specsize);//取最小值
} else {
result = defaultsize;
}
return result;
}
@override
protected void ondraw(canvas canvas) {
super.ondraw(canvas);
drawindicator(canvas);
}
@override
protected void onlayout(boolean changed, int left, int top, int right, int bottom) {
super.onlayout(changed, left, top, right, bottom);
if (!mhasanimation){
mhasanimation=true;
applyanimation();
}
}
void drawindicator(canvas canvas){
mindicatorcontroller.draw(canvas,mpaint);
}
void applyanimation(){
mindicatorcontroller.createanimation();
}
private int dp2px(int dpvalue) {
return (int) getcontext().getresources().getdisplaymetrics().density * dpvalue;
}
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baseindicatorcontroller.java
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package com.chni.lidong.androidtestdemo.loading;
import android.graphics.canvas;
import android.graphics.paint;
import android.view.view;
/**
* created by lidongon 2016/1/31
*/
public abstract class baseindicatorcontroller {
private view mtarget;
public void settarget(view target){
this.mtarget=target;
}
public view gettarget(){
return mtarget;
}
/**
* 得到view的宽度
* @return
*/
public int getwidth(){
return mtarget.getwidth();
}
/**
* 得到view的高度
* @return
*/
public int getheight(){
return mtarget.getheight();
}
/**
* 刷新view
*/
public void postinvalidate(){
mtarget.postinvalidate();
}
/**
* draw indicator what ever
* you want to draw
* 绘制indicate
* @param canvas
* @param paint
*/
public abstract void draw(canvas canvas,paint paint);
/**
* create animation or animations
* ,and add to your indicator.
* 创建动画或者动画集合，添加到indcator
*/
public abstract void createanimation();
}
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ballspinfadeloaderindicator.java
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package com.chni.lidong.androidtestdemo.loading;
import android.graphics.canvas;
import android.graphics.paint;
import com.nineoldandroids.animation.valueanimator;
/**
* created by lidongon 2016/1/31
*/
public class ballspinfadeloaderindicator extends baseindicatorcontroller {
public static final float scale=1.0f;
public static final int alpha=255;
/**
* 圆点的比例
*/
float[] scalefloats=new float[]{scale,
scale,
scale,
scale,
scale,
scale,
scale,
scale};
/**
* 圆点的透明度集合
*/
int[] alphas=new int[]{alpha,
alpha,
alpha,
alpha,
alpha,
alpha,
alpha,
alpha};
@override
public void draw(canvas canvas, paint paint) {
float radius=getwidth()/10;
for (int i = 0; i < 8; i++) {
canvas.save();
point point=circleat(getwidth(),getheight(),getwidth()/2-radius,i*(math.pi/4));
canvas.translate(point.x,point.y);
canvas.scale(scalefloats[i],scalefloats[i]);
paint.setalpha(alphas[i]);
canvas.drawcircle(0,0,radius,paint);
canvas.restore();
}
}
/**
* 圆o的圆心为(a,b),半径为r,点a与到x轴的为角α.
*则点a的坐标为(a+r*cosα,b+r*sinα)
* @param width
* @param height
* @param radius
* @param angle
* @return
*/
point circleat(int width,int height,float radius,double angle){
float x= (float) (width/2+radius*(math.cos(angle)));
float y= (float) (height/2+radius*(math.sin(angle)));
return new point(x,y);
}
@override
public void createanimation() {
int[] delays= {0, 120, 240, 360, 480, 600, 720, 780, 840};
for (int i = 0; i < 8; i++) {
final int index=i;
valueanimator scaleanim=valueanimator.offloat(1,0.4f,1);//创建valueanimator对象
scaleanim.setduration(1000);//设置动画的持续时间
scaleanim.setrepeatcount(-1);//设置动画是否重复
scaleanim.setstartdelay(delays[i]);//延迟启动动画
scaleanim.addupdatelistener(new valueanimator.animatorupdatelistener() {//valueanimator只负责第一次的内容，因此必须通过监听来实现对象的相关属性的更新
@override
public void onanimationupdate(valueanimator animation) {
scalefloats[index] = (float) animation.getanimatedvalue();//获取当前帧的值
postinvalidate();
}
});
scaleanim.start();//启动属性动画
valueanimator alphaanim=valueanimator.ofint(255, 77, 255);//透明度动画
alphaanim.setduration(1000);//
alphaanim.setrepeatcount(-1);
alphaanim.setstartdelay(delays[i]);
alphaanim.addupdatelistener(new valueanimator.animatorupdatelistener() {
@override
public void onanimationupdate(valueanimator animation) {
alphas[index] = (int) animation.getanimatedvalue();
postinvalidate();
}
});
alphaanim.start();
}
}
final class point{
public float x;
public float y;
public point(float x, float y){
this.x=x;
this.y=y;
}
}
}
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uihelp.java
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package com.chni.lidong.androidtestdemo.utils;
import android.app.activity;
import android.app.dialog;
import android.view.layoutinflater;
import android.view.view;
import android.widget.linearlayout;
import android.widget.textview;
import com.chni.lidong.androidtestdemo.r;
/**
* 对话框的实现
* @author 李东
* @date 2014-11-23
*/
public class uihelper {
/** 加载数据对话框 */
private static dialog mloadingdialog;
/**
* 显示加载对话框
* @param context 上下文
* @param msg 对话框显示内容
* @param cancelable 对话框是否可以取消
*/
public static void showdialogforloading(activity context, string msg, boolean cancelable) {
view view = layoutinflater.from(context).inflate(r.layout.layout_loading_dialog, null);
textview loadingtext = (textview)view.findviewbyid(r.id.id_tv_loading_dialog_text);
loadingtext.settext(msg);
mloadingdialog = new dialog(context, r.style.loading_dialog_style);
mloadingdialog.setcancelable(cancelable);
mloadingdialog.setcontentview(view, new linearlayout.layoutparams(linearlayout.layoutparams.match_parent, linearlayout.layoutparams.match_parent));
mloadingdialog.show();
}
/**
* 关闭加载对话框
*/
public static void hidedialogforloading() {
if(mloadingdialog != null && mloadingdialog.isshowing()) {
mloadingdialog.cancel();
}
}
}
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对话框的布局：
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<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/bg_loading_dialog_shape"
android:gravity="center"
android:minheight="60dp"
android:minwidth="180dp"
android:orientation="vertical"
android:padding="@dimen/padding_10" >
<linearlayout
android:layout_width="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:layout_height="wrap_content">
<com.chni.lidong.androidtestdemo.loading.avloadingindicatorview
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:indicator="ballspinfadeloader"
app:indicator_color="@color/green"
/>
</linearlayout>
<textview
android:id="@+id/id_tv_loading_dialog_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margintop="@dimen/padding_5"
android:text="正在登录…"
android:textcolor="@color/content"
android:textsize="14sp" />
</linearlayout>
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对话框的样式：
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<!-- 自定义loading dialog -->
<style name="loading_dialog_style" parent="@android:style/theme.dialog">
<item name="android:windowframe">@null</item>
<item name="android:windownotitle">true</item>
<item name="android:windowbackground">@color/transparent</item>
<item name="android:windowisfloating">true</item>
<item name="android:windowcontentoverlay">@null</item>
</style>
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mainactivity.java
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public class main7activity extends appcompatactivity {
@override
protected void oncreate(bundle savedinstancestate) {
super.oncreate(savedinstancestate);
setcontentview(r.layout.activity_main7);
toolbar toolbar = (toolbar) findviewbyid(r.id.toolbar);
setsupportactionbar(toolbar);
floatingactionbutton fab = (floatingactionbutton) findviewbyid(r.id.fab);
fab.setonclicklistener(new view.onclicklistener() {
@override
public void onclick(view view) {
snackbar.make(view, "replace with your own action", snackbar.length_long)
.setaction("action", null).show();
}
});
uihelper.showdialogforloading(this, "正在加载...", true);
handler handler = new handler();
handler.postdelayed(new runnable() {
@override
public void run() {
uihelper.hidedialogforloading();
}
},10000);
}
}
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效果图;
以上就是本文的全部内容，希望对大家的学习有所帮助。